Search for $D^0-{\bar{D}}^0$ Mixing Using Doubly Flavor Tagged Semileptonic Decay Modes

Abstract

We have searched for $D^0-{\bar{D}}^0$ mixing in $D^{\ast +}\to {\pi }^{+}{D}^0$ decays with $D^0\to K^{(\ast )}e\nu$ in a sample of $e^{+}{e}^{-}\to c\bar{c}$ events produced near 10.58 GeV. The charge of the slow pion from charged $D^{\ast }$ decay tags the charm flavor at production, and it is required to be consistent with the flavor of a fully reconstructed second charm decay in the same event. We observe 3 mixed candidates compared to 2.85 background events expected from simulation. We ascribe a 50% systematic uncertainty to this expected background rate. We find a central value for the mixing rate of $0.4\times 10^{-4}$. Using a frequentist method, we set corresponding 68% and 90% confidence intervals at $(-5.6,7.4)\times 10^{-4}$ and $(-13,12)\times 10^{-4}$, respectively.

13 pages, 7 figures, submitted to Phys.Rev.D

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